I am saying that jacket vs BP/W have inherent properties that must be considered when deciding to use either type of gear.
You should not treat them like they are identical devices, and you should not be surprised when they perform differently.
I wouldn't disagree with you if that was all that you had said. But you went further.
It's this part, particularly the bolded portions, that I disagree with.
Regarding the vertical position of some divers.....If you wear a jacket BCD, then expect to trim vertically. Its what they are designed to do. Fighting that is counterproductive. BP/W are meant to float horizontally. If that is what you want, get a wing.
Neither one is more right than the other. Each is correct for its own design.
(emphasis added)
1. I don't believe that it's counterproductive to swim in horizontal trim with a jacket style BCD, as you stated. In fact, I think it's a good idea. You probably won't die if you don't swim that way, but if the question is, "is it better for a diver with a jacket BCD to have Horizontal or Vertical trim?", the better answer is "horizontal."
2. I don't think that most jacket style BCD's were designed for vertical trim. It
may be easier to have horizontal trim with a Bp/W, but I see no evidence that the manufacturers of jacket BCD's engineered them for the purpose of swimming upright through the water. By and large, I don't think that is there intended use.
3. I don't agree that "Neither one is more right than the other." Again, it's not going to kill you if you dive out of trim, (probably), but as a general proposition, it's not the better way to dive for either kind of BCD. Just how important it is depends a lot on what kind of diving you do. But I don't see how any experienced diver could argue that diving vertically in a jacket BCD is just as good as diving horizontally in a Bp/w. As a general proposition, that's just not true, whether one is talking about safety, mobility, control, etc. There may be exceptions, but I don't agree that is the rule.
So we'll just have to disagree.